No, there is no way to evolve Haunter into Gengar without trading.
You must have a Gastly handy if you want to get a Gengar, as this is the starting Pokémon in the evolution chain. These spooky but cute Pokémon come out at night and can be easily found by heading to the Crimson Mirelands, Coronet Highlands, or Alabaster Islands.
Gengar is a powerful Ghost Pokémon that evolved from Haunter and can be difficult to obtain. You must catch or trade for a Haunter (or Gastly if you don’t mind leveling it) and then trade that Haunter to someone else to trigger its evolution.
His base stat (500) is good and he is immune to normal, combat and ground attacks. However, similar to Misdreavus, Gengar is weak to spirit and dark attacks, as well as psychic attacks. Regardless, Gengar is still a Pokemon worth having on your team.
Pokémon’s Hisui region has found a new way to get these evolutions without even trading with other people. There’s a chance you can catch them directly in different areas, but there’s also an easier way to do it with their pre-evolution.
It evolves from Gastly at level 25 and evolves into Gengar when traded or when exposed to a connection string (Pokémon Legends: Arceus).
Machoke, Graveler, Haunter, and Kadabra evolve by having enough EVs in Attack, Defense, Speed, and Special Power (five Protein, Iron, Carbs, or Calcium is enough).
Gengar has the ability to perfectly hide in the shadow of any object, giving it exceptional stealth.
To trade locally, you don’t need an internet connection or a Nintendo Online subscription. To do this, open Pokémon Sword and Shield, then press the Y button on your right Joy-Con controller to open Y-Comm. Select Link Trade at the top, then Select “Set link code”.
Unfortunately you cannot trade Pokémon with other emulator users; However, you can trade yourself to port Pokémon between the two emulators.
Gardevoir embodies the more “emotional” aspects of psychics, while Alakazam is smarter. Gardevoir’s abilities are usually related to emotions. It’s meant to be a Pokemon that would give its life for its trainer, and given its background, that’s very believable.
Gengar’s best moves are Lick and Shadow Ball when attacking Pokémon in Gyms. This move combo has the highest overall DPS and is also the best move set for PVP battles.
Mega Alakazam is the Mega Evolution of Alakazam activated through the use of Mega Stone, revealed in the August 2013 issue of CoroCoro. It remains a pure clairvoyant type. Mega Alakazam uses the track ability, which copies the special ability when entering combat.
As I understand it, fake games can’t stream Pokemon like this one. The cartridge is also recognized by my 3DS and DSi.